import pygame.font
from pygame.sprite import Group
from ship import Ship


class ScoreBoard():
    """
    显示得分信息的类
    """

    def __init__(self, settings, screen, stats):
        """
        初始化显示得分设计的属性
        """
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.settings = settings
        self.stats = stats

        # 显示得分信息时使用的字体设置
        self.color = (30, 30, 30)
        self.bg_color = (230, 230, 230)
        self.font = pygame.font.SysFont(None, 48)

        # 准备包含最高得分和当前得分的图像
        self.prep_score()
        self.prep_high_score()
        self.prep_level()

        self.prep_ships()

    def prep_score(self):
        """
        将得分转换为一幅渲染的图像
        """
        rounded_score = int(round(self.stats.score, -1))
        score_str = "{:,}".format(rounded_score)
        self.score_img = self.font.render(score_str, True, self.color, self.bg_color)

        # 将得分放在屏幕右上角
        self.score_rect = self.score_img.get_rect()
        self.score_rect.right = self.screen_rect.right - 20
        self.score_rect.top = 20

    def prep_high_score(self):
        """
        将最高得分转换为渲染的图像
        """
        high_score = int(round(self.stats.high_score, -1))
        high_score_str = "{:,}".format(high_score)
        self.high_score_img = self.font.render(high_score_str, True, self.color, self.bg_color)

        # 将最高得分放在屏幕顶部中央
        self.high_score_rect = self.high_score_img.get_rect()
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = self.score_rect.top

    def show_score(self):
        """
        在屏幕上显示飞船和得分
        """
        self.screen.blit(self.score_img, self.score_rect)
        self.screen.blit(self.high_score_img, self.high_score_rect)
        self.screen.blit(self.level_img, self.level_rect)

        # 绘制飞船
        self.ships.draw(self.screen)

    def prep_level(self):
        """
        将登记转换为渲染的图像
        """
        self.level_img = self.font.render(str(self.stats.level), True, self.color, self.bg_color)

        # 将登记放在得分下方
        self.level_rect = self.level_img.get_rect()
        self.level_rect.right = self.score_rect.right
        self.level_rect.top = self.score_rect.bottom + 10

    def prep_ships(self):
        """
        显示余下的飞船数目
        """
        self.ships = Group()
        for ship_number in range(self.stats.ship_number):
            ship = Ship(self.settings, self.screen)
            ship.rect.x = 10 + ship_number * ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)
